A bifunctional compound and a method for manufacturing the same are revealed. The structural formula of the compound includes two main functional groups. One functional group is a diamide dithiolate (N2S2) ligand able to bind with radioisotopes. The other functional group is polybasic carboxylic acid that binds to biochemical substances. Based on properties of the above two functional groups, the compound of the present invention can be used for preparation of radiopharmaceuticals such as radiotracter for disease diagnosis or radioactive therapeutic agent for disease treatment.